Modified Step-Up Method for Calibration of DC High-Voltage Dividers

The dc high voltage is usually measured with high-voltage divider which plays the role of the ratio standard linking the unknown high voltage to the well-known low-voltage standards. A step-up method had been proposed to calibrate the dividing ratios of the high-voltage dividers at nominal test voltage. The step-up technique has been newly modified for improving the transfer accuracy of reference values determined in voltage stack stage, with employing an additional source voltage monitoring device, and successfully applied to precisely determine the dividing ratios up to 100 kV. Typical standard uncertainty for the dividing ratios is estimated to be approximately 5 × 10 -6 .